Check the earlier version of the  WHO.... where they allow  'herd immunity'  to also come from (recovery)  Natural infection.  Latest  WHO  definition specifically limits  'Herd Immunity'  to being a product of  'vaccination'  ONLY.     -  ??? !
Speaking of  Evil,  and this from the  Dutch  RIVM - their "CDC".  
They've had enough deaths to get a handle on ages etc.   These  COVID  figures 
include  2 to 6  serious underlying conditions,  "co-morbidities"
For comparison,  the Dutch allege a normal  'flu takes out an  average of .....0.16%
Mortality  of  various virus:-
Ebola  kills 50%  with 
Smallpox at 30%,  and 
 
SARS  (SARS-Cov1)  at 9.6%
But,  
SARS-C0v2  or  'COVID-19' is very much  'age-ist' and 
under 20,  forget it.
Up to 40  it's 0.0003%  with  
up to 60 on   0.0035%.  (nearly 10x the 40 year olds...)
60 - 70  rates at 0.02% 
Over 80 and you're   
history,,,    0.5%,   but remember,  you've got to have at least  two  co-morbidities.  Otherwise you're in danger of Recovery.
More grist for the mill...  Bare numbers, without the headlines. 
The Leading Causes of Death in the US for 2020 | Cardiology | JAMA | JAMA Network   -  add to those    Medical Mistakes...